Day Six

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+# Day Six: Custom Customs
+import os, strutils
+
+let input: string = paramStr(1)
+var sum, sumAll: int = 0
+
+for group in split(readFile(input), "\n\n"):
+  var count, countAll: int = 0
+  for i, answer in replace(group, "\n"):
+    if find(replace(group, "\n"), answer) == i:
+      inc(count)
+  for i, answer in split(group, "\n")[0]:
+    if find(split(group, "\n")[0], answer) == i:
+      block everyone:
+        for person in split(group, "\n"):
+          if not contains(person, answer):
+            break everyone
+        inc(countAll)
+  sum += count
+  sumAll += countAll
+echo sum
+echo sumAll